/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Character/CharacterGroundConstraint.h
Set the target orientation change about the vertical axis. This is used to turn the character when it is on the ground. The solver will do this by applying a torque if the character is considered to be on the ground and the torque required is less than or equal to the torque limit. For orientation change off the ground, e.g. in air steering, set an angular velocity or impulse on the character body directly. This should be set every frame for a locomoting character, and the value is typically controlled either from a character movement model or from root motion extracted from an animation sequence.
void SetTargetDeltaFacing ( const [FReal](API\Runtime\ChaosCore\Chaos\FReal) & Value )